Quote Quoting Mr. Knowitall
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Actually she could, although he would be entitled to notice of the petition and, if applicable, could attempt to defend on the basis that she concealed the child from him. That would be something that might occur within the context of step-parent adoption.

A TPR/step-parent adoption based upon abandonment simply will not happen without the biological father's rights first being established, except in extremely unusual circumstances...and OP hasn't given any indication that they would apply here.

(I think y'all know where I'm going with this one )